Basic derivatives

Question

$x=3 \sin^2(2t)$

$y=3 \cos(2t)$

Equations given for the function $y=f(x) $

What is the derivative of $y=2$ point?

Answer 1

See, we have:

$$\begin{align}\frac{x}{3}&=\sin^22t \\ &=1-\cos^2 2t \\ &=1-\left(\frac{y}{3}\right)^2\end{align}$$

Now can you take it from here?